Cell Spacing
Mostrando 1-12 de 158 artigos, teses e dissertações.
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1. Is sickle cell anemia a risk factor for severe dental malocclusion?
The aim of this study was to investigate possible associations between sickle cell anemia (SCA) and the severity of dental malocclusion (MO). This was a retrospective cohort study of 93 individuals with SCA (G1) and 186 individuals without the disease (G2). SCA patients were randomly selected by a simple draw from patients treated in the Centro de Hematologi
Braz. oral res.. Publicado em: 23/01/2015
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2. Effects of cellular growth on fatigue life of directionally solidified hypoeutectic Al-Fe Alloys
Al-Fe hypoeutectic alloys are a family of casting alloys characterized by cell growth, low cost and appreciable formability. It is well known that fatigue strength is a requirement of prime importance considering the nature of load typically observed during operations involving the risers used in oil extraction. The aim of this study is to examine the influe
Mat. Res.. Publicado em: 28/02/2014
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3. Rapid solidification of an Al-5Ni alloy processed by spray forming
Recently, intermetallic compounds have attracted much attention due to their potential technological applications as high-temperature materials. In particular the intermetallic compounds, associated with the Al-Ni binary system stand out as promising candidates for high-temperature materials for the use in harsh environments. It is expected that a bulk Al-Ni
Mat. Res.. Publicado em: 08/05/2012
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4. Transient solidification of hypomonotectic and monotectic A1-Bi alloys / Solidificação transitoria de ligas hipomonotetica e monotetica do sistema A1-Bi
Ligas de alumínio dispersas com bismuto apresentam aplicações promissoras em componentes automotivos resistentes ao desgaste. Essas dispersões de elementos de baixa temperatura de fusão diminuem a dureza e escoam facilmente em condições de deslizamento, resultando em um comportamento tribológico favorável. Muitos estudos têm sido realizados a fim d
Publicado em: 2008
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5. Influence of either operational speed and the pressure applied on compress wheels in the initial establishment of the maize crop under no-till system / Influência da velocidade operacional e da carga aplicada pelas rodas compactadoras sobre o estabelecimento inicial da cultura do milho em sistema de plantio direto
Since Brazil is one of the main maize producers throughout the world, this crop becomes an important target for research. To obtain the successful implantation of the crop, a good soil-seed contact should be promoted, besides to be careful about the good distribution of the plantlets. The no-till planting minimizes the undesirable effects from the preparatio
Publicado em: 2007
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6. Pattern formation in granular systems / Formação de padrões em meios granulares
In this work we study the pattern formation in the interface between two types of granular materials in a Hele-Shaw cell. Different types of patterns, ranging from almost circular to fingered ones were observed, varying the ratio between the size of the grains and the cell spacing. The transition from patterns with fingers to rounded patterns seems to be con
Publicado em: 2006
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7. Effect of epithelial debridement on human cornea proteoglycans
Corneal transparency is attributed to the regular spacing and diameter of collagen fibrils, and proteoglycans may play a role in fibrillogenesis and matrix assembly. Corneal scar tissue is opaque and this opacity is explained by decreased ultrastructural order that may be related to proteoglycan composition. Thus, the objectives of the present study were to
Brazilian Journal of Medical and Biological Research. Publicado em: 2001-03
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8. Crescimento e caracterização de liga eutetica sn-se
In many eutectic alloys. directional solidification is likely to resu1t in the formation of a fine anisotropic and regular structure of the lamellar or rod type. The development of specific microstructural characteristics depends upon the conditions at and the shape of the solid/liquid interface. To grow composite materiais from eutectic alloys is the main p
Publicado em: 1994
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9. Transcribed chromatin exhibits an altered nucleosomal spacing.
The nucleosomal repeat lengths of bulk chromatin and the chromatin of transcriptionally active and inactive genes were analyzed in two mouse cell lines and adult mouse spleens. The adult beta-globin gene exhibits a nucleosomal repeat length approximately 11 base pairs longer than (i) an inactive embryonic globin gene, epsilon y3; (ii) an immunoglobulin heavy
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10. Substrate Topography Induces a Crossover from 2D to 3D Behavior in Fibroblast Migration
In a three-dimensional environment, cells migrate through complex topographical features. Using microstructured substrates, we investigate the role of substrate topography in cell adhesion and migration. To do so, fibroblasts are plated on chemically identical substrates composed of microfabricated pillars. When the dimensions of the pillars (i.e., the diame
The Biophysical Society.
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11. High level heterologous expression in E. coli using mutant forms of the lac promoter.
Single base deletions in the lac promoter which reduced the 18bp spacing between the -35 and -10 homology regions to 17bp, increased the strength of the promoter. A single base substitution (T----G) in the -35 region to generate the consensus sequence TTG-ACA increased the strength further and no longer required a 17bp spacing. The mutated lac promoter was a
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12. Fine Structures of Cell Envelopes of Chlamydia Organisms as Revealed by Freeze-Etching and Negative Staining Techniques
The cell walls of Chlamydia psittaci (meningopneumonitis strain) were examined by the freeze-etching and negative staining techniques. It was observed that the cleaved convex surface of the developmental, reticulate body was covered with numerous non-etchable particles 9 to 10 nm in diameter, these particles being rarely seen on the concave surface. Similarl